Introduction：
VTSD 9561D is a 20dB pulse limiter produced by Schwarzbeck and authorized by EUTTEST in Shenzhen. In principle, it is also a 20dB fixed attenuator, the difference is that the pulse limiter is better than ordinary fixed attenuator to protect the expensive receiver equipment from large signal damage.
The 9561D features a diode design with a built-in 20dB high power attenuator and a fuse lamp in the limiter to protect sensitive EMI measurement equipment during measurements of high energy radiated levels. EMC testers can quickly and reliably identify severe overloads in sensitive equipment due to the built-in fuse light, which is replaceable. The pulse limiter has a very flat frequency response for high measurement accuracy, even if only a few sample values are used for calibration.
Optional 10dB pulse limiter if required:VTSD 9561F
Technical parameters：
| Limiter Model | VTSD 9561D |
| Product name | 20dB Pulse Limiter |
| manufacturer | Schwarzbeck |
| Domestic agents | EUTTEST |
| Available Test Frequency | DC-200MHz |
| Voltage range | <100dBμV |
| impedance | 50Ω |
| insertion loss | 20dB±0.5dB |
| frequency response | ±0.5dB |
| connector | BNC or N |
| lantern | OSRAM 2306 |
| size | 28*36*88mm |
| weight | 150g |
Graph of related technical parameters：
The following S21 plot data for the VTSD 9561 D needs to be manually read and entered into the EMI receiver for internal correction.
S21 Curve Diagram
